/Engine/Source/Runtime/Core/Public/Math/Quat.h
Initialize thisTQuatfrom aFString. The string is expected to contain X=, Y=, Z=, W=, otherwise thisTQuatwill have indeterminate (invalid) values.
true if theTQuatwas initialized; false otherwise.
bool InitFromString ( const [FString](API\Runtime\Core\Containers\FString) & InSourceString )